can i add alarm in my nrf51dk board? if yes then how?

RE: can i add alarm in my nrf51dk board? if yes then how?

iqra — Mon, 28 Dec 2015 20:54:03 GMT

thanks.. would you help me to find which buzzer i can use or is there a builtin buzzer?

RE: can i add alarm in my nrf51dk board? if yes then how?

ovrebekk — Fri, 13 Nov 2015 10:23:02 GMT

The easiest way to make a beep is to use the app_pwm driver in the SDK. You will have to set the PWM period according to the beep frequency you want, and then you can simply set the duty cycle to 50% to produce a square wave at that frequency.

The reload time (in us) relates to frequency like this: reload_us = 1000000 / FREQ

To turn off the sound, just set the duty cycle to 0% or 100%.

For an example of how to use the PWM driver, please have a look at the PWM example in the SDK:
\nRF51 SDK_v9.0.0\examples\peripheral\pwm

Best regards
Torbjørn

RE: can i add alarm in my nrf51dk board? if yes then how?

iqra — Thu, 12 Nov 2015 13:31:41 GMT

A simple beep is enough. Yes from my android app there is a button for this and my nrf 51 dk will produce a beep.any idea?

RE: can i add alarm in my nrf51dk board? if yes then how?

ovrebekk — Thu, 12 Nov 2015 10:04:13 GMT

Maybe you could add some more details on what you are trying to do.

If I understand you correctly you want the nRF51 board to sound an alarm either after a certain time, or after a command is sent from some other device?

Do you want to play a sound file from the nRF51, or will a simple beep be enough?